commit
21ce57840243c7b70fbc1ebd3dceeb70bb6e9e09 upstream.
Fix NULL-pointer dereference in write() should the device lack the
expected interrupt-out endpoint:
Unable to handle kernel NULL pointer dereference at virtual address
00000054
...
PC is at kobil_write+0x144/0x2a0 [kobil_sct]
Fixes:
1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Johan Hovold <johan@kernel.org>
[bwh: Backported to 3.2: add this check to the existing
usb_serial_driver::attach implementation]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
struct usb_host_interface *altsetting;
struct usb_host_endpoint *endpoint;
struct usb_host_interface *altsetting;
struct usb_host_endpoint *endpoint;
+ if (serial->num_interrupt_out < serial->num_ports) {
+ dev_err(&serial->interface->dev, "missing interrupt-out endpoint\n");
+ return -ENODEV;
+ }
+
priv = kmalloc(sizeof(struct kobil_private), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv = kmalloc(sizeof(struct kobil_private), GFP_KERNEL);
if (!priv)
return -ENOMEM;